1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
Rule:
--
Sid:
120-1
--
Summary:
This event is generated when the pre-processor http_inspect
detects network traffic that may constitute an attack.
--
Impact:
Unknown.
--
Detailed Information:
This event is generated when the http_inspect pre-processor detects the
presence of a web server running on a non-defined port.
Web server ports are defined in snort.conf as the variable $HTTP_PORTS
and also in the section for http_inspect. When a server is accessed on a
port not defined in snort.conf the presence of web traffic generates an
event. This may indicate the presence of an unauthorized web server.
--
Affected Systems:
All.
--
Attack Scenarios:
A web server may be used to transfer files from inside the protected
network to unauthorized recipients on the outside.
--
Ease of Attack:
Simple.
--
False Positives:
None Known.
--
False Negatives:
None Known.
--
Corrective Action:
Check the target host for signs of compromise.
Apply any appropriate vendor supplied patches.
--
Contributors:
Daniel Roelker <droelker@sourcefire.com>
Sourcefire Vulnerability Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>
--
Additional References:
HTTP IDS Evasions Revisited - Daniel Roelker
http://docs.idsresearch.org/http_ids_evasions.pdf
--
|
